Energy and Resources Minister Chris Hartcher says he is disturbed at the alliance between farmers and green groups.

Mr Hartcher has written an open letter to newspapers, condemning today's rally and predicting that environmentalists will turn on farmers and try to reduce the viability of the agricultural sector.

"If these groups succeed in stopping exploratory drilling, how long will it be before they reduce farming viability and stop farmers from drilling bore holes?" he said in the letter.

Co-creator of Dirtgirlworld Cate McQuillen, who is from the Clarence Valley, spoke to ABC North Coast from Sydney this morning.

She has a large Dirtgirl replica in tow to show the character's stance on coal seam gas.

"Dirtgirl is here because she wrote a song last year called Every Little Drop, about how precious water is," said Ms McQuillen.

"To children, water security is incredibly important so she's here for that reason.

"Cate McQuillen is here because I believe if you want a government to understand how you feel you have to show up."

Ms McQuillen described Mr Hartcher's comments as 'ridiculous.'

"The whole idea is for all of the community - there's the farmers, Country Women's Association - all kinds of fantastic groups from all walks of life and all political persuasions gathering because this is not a political issue," she said.

"This is a community issue, this is a planet issue.

"This isn't just some fringe group.

"We're all one people on this planet, there's nothing disturbing about it.